【摘要】 通过改进动能修正系数和引入综合局部系数,克服了常规的水面线计算方法计算山区性河段水面线时出现的下游水头比上游水头大或糙率、局部损失系数变化较大的问题,避免了在计算山区性河流水面线时使用虚糙率在物理概念上解释困难和扣死水操作复杂等缺点.通过改进的遗传算法对糙率、局部损失系数或综合局部系数等进行优化选择,使参数选择更加合理.通过对蓬莱滩河段水面线计算并和传统的方法进行比较证明该方法对山区性河流水面线的计算是行之有效的.更多还原

【Abstract】 To resolve the problems of the down section′s head higher than the up section′s head and the parameters′ values varing in wide range and avert the hardness of explaining the concept of negative roughness and the operational difficulty in taking out backwater when the conventional method calculated the water level of the rivers in mountainous district, the revised coefficient of energy is improved and the synthesis coefficient of local loss is introduced. Furthermore, an improved genetic algorithm is introduced to optimize the roughness, the revised coefficient of energy or the synthesis coefficient of local loss, which makes the parameter more reasonable. The water level of Penglaitan beach is calculated and the experimental results and different methods are compared. The results show that the proposed method fits the water level calculation of the rivers in the mountainous district and is reliable.更多还原